Classifications

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  • C07K—PEPTIDES
  • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
  • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
  • C07K14/70503—Immunoglobulin superfamily
  • C07K14/7051—T-cell receptor (TcR)-CD3 complex
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
  • A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
  • A61K35/14—Blood; Artificial blood
  • A61K35/17—Lymphocytes; B-cells; T-cells; Natural killer cells; Interferon-activated or cytokine-activated lymphocytes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K40/00—Cellular immunotherapy
  • A61K40/10—Cellular immunotherapy characterised by the cell type used
  • A61K40/15—Natural-killer [NK] cells; Natural-killer T [NKT] cells
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K40/00—Cellular immunotherapy
  • A61K40/30—Cellular immunotherapy characterised by the recombinant expression of specific molecules in the cells of the immune system
  • A61K40/31—Chimeric antigen receptors [CAR]
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K40/00—Cellular immunotherapy
  • A61K40/30—Cellular immunotherapy characterised by the recombinant expression of specific molecules in the cells of the immune system
  • A61K40/35—Cytokines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K40/00—Cellular immunotherapy
  • A61K40/40—Cellular immunotherapy characterised by antigens that are targeted or presented by cells of the immune system
  • A61K40/41—Vertebrate antigens
  • A61K40/42—Cancer antigens
  • A61K40/4202—Receptors, cell surface antigens or cell surface determinants
  • A61K40/421—Immunoglobulin superfamily
  • A61K40/4211—CD19 or B4
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
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  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
  • C07K14/52—Cytokines; Lymphokines; Interferons
  • C07K14/525—Tumour necrosis factor [TNF]
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  • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
  • C12N15/09—Recombinant DNA-technology
  • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
  • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
  • C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
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  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
  • C12N5/06—Animal cells or tissues; Human cells or tissues
  • C12N5/0602—Vertebrate cells
  • C12N5/0634—Cells from the blood or the immune system
  • C12N5/0646—Natural killers cells [NK], NKT cells
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2239/00—Indexing codes associated with cellular immunotherapy of group A61K40/00
  • A61K2239/10—Indexing codes associated with cellular immunotherapy of group A61K40/00 characterized by the structure of the chimeric antigen receptor [CAR]
  • A61K2239/23—On/off switch
  • A61K2239/25—Suicide switch
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2239/00—Indexing codes associated with cellular immunotherapy of group A61K40/00
  • A61K2239/38—Indexing codes associated with cellular immunotherapy of group A61K40/00 characterised by the dose, timing or administration schedule
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2239/00—Indexing codes associated with cellular immunotherapy of group A61K40/00
  • A61K2239/46—Indexing codes associated with cellular immunotherapy of group A61K40/00 characterised by the cancer treated
  • A61K2239/48—Blood cells, e.g. leukemia or lymphoma
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N2510/00—Genetically modified cells

Definitions

• Embodiments of the disclosure encompass at least the fields of cell biology, molecular biology, immunology, cell therapy, and medicine.
• Adoptive cell therapy with chimeric antigen receptor (CAR)-engineered and T- cell receptor (TCR)-transduced T cells has been associated with reports of serious adverse events such as cytokine release syndrome and neurotoxicity, as well as on-target/off tumor toxicities.
• CAR chimeric antigen receptor
• TCR T- cell receptor
• the present disclosure provides a solution for a long-felt need in the art of safety mechanisms for cell therapies.
• Embodiments of the present disclosure are directed to systems, methods, and compositions related to cell therapy, including safety mechanisms to control cell therapy.
• a unique suicide gene is utilized in conjunction with cell therapy of any kind to control its use and allow for controllable termination of the cell therapy at a desired event and/or time.
• the suicide gene is employed in transduced cells for the purpose of eliciting death for the transduced cells when needed.
• the suicide/depletion gene is a tumor necrosis factor (TNF)-alpha mutant that is uncleavable by standard enzymes that cleave TNF in nature, such as TNF-alpha-converting enzyme (also referred to as TACE).
• TNF tumor necrosis factor
• the TNF-alpha mutant is membrane-bound, inactive, and nonsecretable, in particular embodiments.
• the TNF-alpha mutant of the disclosure is targetable by one or more agents that bind the mutant, including at least an antibody, such that following binding of the agent(s) to the TNF-alpha mutant on the surface of the cell, the cell dies.
• Embodiments of the disclosure allow the TNF- alpha mutant to be utilized as a marker for cells that express it.
• Embodiments of the disclosure include compositions comprising a transduced cell comprising a nucleic acid that encodes one or more engineered nonsecretable tumor necrosis factor (TNF)-alpha mutant polypeptides and a nucleic acid that encodes one or more therapeutic gene products.
• TNF-alpha mutant polypeptide comprises a deletion with respect to SEQ ID NO:8 of the following: amino acid residue 1 and amino acid residue 12; amino acid residue 1 and amino acid residue 13; amino acid residues 1-12; amino acid residues 1-13; or amino acid residues 1-14.
• the therapeutic gene product of the composition may or may not be an engineered receptor, such as a T-cell receptor, a chimeric antigen receptor (CAR), cytokine receptor, homing receptor, or chemokine receptor. Any of the engineered receptors may or may not target an antigen, such as a cancer antigen. When the engineered receptor is a CAR, the CAR may or may not comprises one or more costimulatory domains, such as CD28, DAP12, or both.
• an engineered receptor such as a T-cell receptor, a chimeric antigen receptor (CAR), cytokine receptor, homing receptor, or chemokine receptor.
• Any of the engineered receptors may or may not target an antigen, such as a cancer antigen.
• the engineered receptor is a CAR
• the CAR may or may not comprises one or more costimulatory domains, such as CD28, DAP12, or both.
• the nucleic acid that encodes the TNF-alpha mutant polypeptide and the nucleic acid that encodes the therapeutic gene product are the same nucleic acid molecule, although the nucleic acid that encodes the TNF-alpha mutant polypeptide and the nucleic acid that encodes the therapeutic gene product may be different nucleic acid molecules.
• the nucleic acid molecule may be a vector, including a viral vector (retroviral vector, lentiviral vector, adenoviral vector, or adeno-associated viral vector) or a non-viral vector, such one that comprises a plasmid, lipid, transposon, or combination thereof.
• a viral vector retroviral vector, lentiviral vector, adenoviral vector, or adeno-associated viral vector
• non-viral vector such one that comprises a plasmid, lipid, transposon, or combination thereof.
• the transduced cells of the composition of the disclosure may be an immune cell or a stem cell, for example.
• an immune cell includes a T cell, a NK cell, NKT cell, iNKT cell, B cell, regulatory T cell, monocyte, macrophage, dendritic cell, or mesenchymal stromal cell.
• the cell may or may not express one or more exogenously provided cytokines, such as IL-15, IL-12, IL-18, IL-21 or combination thereof.
• the cytokine may or may not be encoded from the same vector as the TNF-alpha mutant gene. In specific cases, the cytokine is expressed as a separate polypeptide molecule as the TNF-alpha mutant and as an engineered receptor of the cell.
• the TNF-alpha mutant polypeptide comprises SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:5, or SEQ ID NO:39.
• the TNF-alpha mutant polypeptide may be encoded by a sequence that comprises SEQ ID NO:2, SEQ ID NO:4, SEQ ID NO:6, or SEQ ID NO:38.
• the TNF-alpha mutant polypeptide lacks one or more further mutations that prevent binding of the TNF-alpha mutant polypeptide to a TNF receptor.
• Embodiments of the disclosure include methods of inducing death for a transduced cell expressing at least an engineered nonsecretable TNF-alpha mutant polypeptide and optionally expressing a therapeutic gene, such as an engineered receptor, the methods comprising the step of providing an effective amount of at least one agent that binds the TNF- alpha mutant on the transduced cell.
• An agent that binds TNF-alpha may be an antibody, small molecule, polypeptide, nucleic acid, or combination thereof, for example. When the agent is an antibody, the antibody may be of any kind, including at least a monoclonal antibody.
• the cell may further express an engineered receptor, including a T-cell receptor, a chimeric antigen receptor (CAR), cytokine receptor, homing receptor, or chemokine receptor. Any of the engineered receptors may bind a cancer or other antigen.
• the method occurs in vivo in an individual with a medical condition and when the individual has been provided a therapy for the medical condition that comprises a plurality of the transduced cells.
• the medical condition may be of any kind, in specific cases the medical condition is cancer.
• the agent may be provided to the individual upon onset of one or more adverse events from the therapy or when an adverse event is suspected of occurring.
• the individual may exhibit one or more symptoms of cytokine release syndrome, neurotoxicity, anaphylaxis/allergy, and/or on-target/off tumor toxicity. In some cases, the individual has been provided, is provided, and/or will be provided an additional therapy for the medical condition.
• the TNF-alpha mutant polypeptide lacks or comprises one or more further mutations that prevent binding of the TNF-alpha mutant polypeptide to a TNF receptor or prevents reverse signaling.
• Embodiments of the disclosure include methods of reducing the effects of cytokine release syndrome in an individual that has received and/or who is receiving cell therapy with cells that express a nonsecretable TNF-alpha mutant, comprising the step of providing an effective amount of one or more agents that bind the mutant to cause in the individual (a) elimination of at least some of the cells of the cell therapy; and (b) reduction in the level of soluble TNF-alpha.
• Embodiments of the disclosure include methods of reducing the risk of toxicity of a cell therapy for an individual, comprising the step of modifying the cells of the cell therapy to express a nonsecretable TNF-alpha mutant.
• the cell therapy may be for cancer, for example.
• the cell therapy may comprise an engineered receptor that targets an antigen.
• Specific embodiments include vectors comprising a sequence that encodes a nonsecretable TNF-alpha mutant and that encodes an engineered receptor.
• the nonsecretable TNF-alpha mutant and the engineered receptor may or may not be encoded from the vector as separate polypeptides.
• sequence of the vector that encodes the nonsecretable TNF-alpha mutant and sequence of the vector that encodes the engineered receptor are separated on the vector by a 2A element or an IRES element.
• the vector may or may not further encode a cytokine, such as IL-15, IL-12, IL-18, IL-2, IL-7, or IL-21.
• the cytokine may be expressed from the vector as a separate polypeptide as the TNF-alpha mutant and the engineered receptor.
• Embodiments of the disclosure include compositions of matter including a nucleic acid sequence comprising SEQ ID NO: 15 or SEQ ID NO: 16.
• FIG. 1 is one example of an experimental plan to mutagenize TNF-alpha in order to ablate membrane cutting sites.
• Perez et al. (1990) reported that deletion in Valine at positions 1 and Proline at position 12 of the extracellular portion of TNF-alpha results in biologically active but non-cleavable TNF-alpha.
• the underlined nucleotides in the left panel show the deleted nucleotides during mutagenesis corresponding to positions 229-279 of nucleotide sequence.
• the wild type primer TCGAGAAGATGATCTGACTGCCTGGGCCAGAGG is SEQ ID NO:42
• the Del VAF1 mutant primer TCG AGA AGA TGA TCT TGC CTG GGC CAG AGG-3 is SEQ ID NO:43
• the CP496 oligonucleotide TGA TCT TGC CTG is SEQ ID NO:44.
• the wild type primer TAC AAC ATG GGC TACAGGCTTGTCACTCGGGGT is SEQ ID NO:45
• the Del PRO 12 mutant primer TAC AAC ATG GGC TAC CTT GTC ACT CGG GGT is SEQ ID NO:46
• the CP498 oligonucleotide GGC TAC CTT GTC is SEQ ID NO:47.
• FIG. 2A illustrates one example of a vector that separately encodes a TNF-alpha mutant (delVall and delProll2) and an example of a CD 19- specific chimeric antigen receptor (CAR) (left panel).
• the right panel illustrates an example of a vector configuration in which the mutant TNF-alpha is encoded as a separate polypeptide from both the CAR molecule and a cytokine.
• FIG. 2B illustrates one example of a vector that separately encodes a TNF-alpha mutant (delVall3), an example of a CAR, and a cytokine.
• FIG. 2C illustrates one example of a vector that separately encodes a TNF-alpha mutant (delVall and delVall3) and an example of a CAR.
• FIG. 2D illustrates one example of a vector that separately encodes a TNF-alpha mutant (where 13 aa spanning Val 1 to Val 13 have been deleted) and an example of a CAR.
• FIG. 2E illustrates one example of a vector that separately encodes a TNF-alpha mutant (delAla-1 to delVall 3 where 14 aa spanning from Ala-1 to Val 13 have been deleted) and an example of a CAR.
• FIG. 3 shows that NK cells transduced with a vector having a construct separately encoding both a TNF-alpha mutant and a CAR express both the CAR and TNF-alpha on their surface.
• FIG. 4A illustrates examples of TNF-alpha inhibitors.
• FIG. 4B demonstrates that NK cells transduced with a vector having a construct separately encoding both a TNF-alpha mutant and a CAR are targeted by TNF-alpha antagonists and eliminated by complement-dependent cytotoxicity (CDC). Greater than 70% of NK cells expressing mutant TNF-alpha are eliminated by CDC within 90 minutes of treatment with infliximab.
• CDC complement-dependent cytotoxicity
• FIG. 5A shows that NK cells transduced with a vector having a construct separately encoding both a TNF-alpha mutant and a CAR produce more effector cytokines and degranulate more efficiently than CAR19-NK cells in response to Raji targets.
• FIG. 5B shows NK cells transduced with a vector having a construct separately encoding both a TNF-alpha mutant and a CAR construct kill Raji targets efficiently.
• FIG. 6 demonstrates that NK cells transduced with a vector that separately expresses a CD 19-specific CAR and a TNF-alpha mutant do not exhibit off-target activity.
• FIG. 7 demonstrates that NK cells transduced with a vector that separately expresses a CD 19-specific CAR and a TNF-alpha mutant do not exhibit off-target activity and do not secrete TNF-alpha non-specifically.
• FIG. 8 illustrates that TNF-alpha receptor binding sites for TNF receptors 1 and 2 vs. TNF-alpha antibodies infliximab and adalimumab are different.
• the sequence in the figure is SEQ ID NO:50.
• FIG. 9 provides a structure of TNF-alpha with noted domains.
• the sequences in the figure are SEQ ID NOS 17, 54-59, 51, 18, and 18-21, respectively, in order of appearance.
• FIG. 10 illustrates a TNFalpha mutation that combines a mutation in the casein kinase I (CKI) consensus sequence in the cytoplasmic domain (underlined) with deletion of Ala- 3 and Gin -2 (in addition to deletion of Ala -1 through and including deletion of Vail 3 that is not depicted) in addition to six examples of additional mutations that interfere with binding to TNF Receptor 1 and TNF Receptor 2 (such mutated sequences are double underlined).
• the nucleotide sequence in the figure is SEQ ID NO:52
• the polypeptide sequence in the figure is SEQ ID NO:53.
• FIGS. 1 lA-1 IB demonstrate that antitumor activity of NK cells transduced with a TNF-alpha mutant-CAR19-IL15 construct is superior to the iC9-CAR19-IL15 construct.
• FIG. 11 A NSG mice with Raji tumor received 3 x 10e6 CAR cord blood NK cells transduced with TNF-alpha mut-CAR19-IL15 construct or iC9-CAR19-IL 15 construct.
• FIG. 11B demonstrates percent survival over time.
• a or “an” may mean one or more.
• the words “a” or “an” when used in conjunction with the word “comprising”, the words “a” or “an” may mean one or more than one.
• “another” may mean at least a second or more.
• aspects of the disclosure may“consist essentially of’ or“consist of’ one or more sequences of the disclosure, for example.
• Some embodiments of the invention may consist of or consist essentially of one or more elements, method steps, and/or methods of the disclosure. It is contemplated that any method or composition described herein can be implemented with respect to any other method or composition described herein.
• the terms“or” and“and/or” are utilized to describe multiple components in combination or exclusive of one another.
• “x, y, and/or z” can refer to“x” alone,“y” alone,“z” alone,“x, y, and z,”“(x and y) or z,”“x or (y and z),” or“x or y or z.” It is specifically contemplated that x, y, or z may be specifically excluded from an
• engineered refers to an entity that is generated by the hand of man, including a cell, nucleic acid, polypeptide, vector, and so forth. In at least some cases, an engineered entity is synthetic and comprises elements that are not naturally present or configured in the manner in which it is utilized in the disclosure.
• Embodiments of the present disclosure concern methods and compositions that provide for a cell therapy to be terminated.
• the present disclosure provides both a marker moiety and a suicide/depletion moiety for cell therapy, based on uncleavable mutants of the 26 kd TNF-alpha.
• the TNF-alpha mutants are uncleavable that leaves them membrane bound and nonsecretable.
• Cells expressing the uncleavable TNF-alpha mutants can be targeted for selective deletion including, for example, using FDA-approved TNF-a antibodies currently in the clinic, such as etanercept, infliximab, or adalilumab.
• the mutated TNF-alpha polypeptide may be co expressed with one or more therapeutic transgenes, such as a gene encoding a TCR or CAR.
• the TNF-alpha mutant expressing cells have superior activity against the tumor target, mediated by the biological activity of the membrane-bound TNF-alpha protein.
• the present disclosure encompasses mutants of TNF-alpha whose expression in particular cells allows the mutant TNF to be targeted by an agent that binds the mutant, thereby causing death for the particular TNF-alpha mutant-bearing cells.
• the mutant TNF-alpha polypeptides are uncleavable and nonsecretable because of one or more mutations, and such uncleavable and nonsecretable polypeptides render the mutant TNF-alpha to be membrane bound.
• the association of the membrane bound TNF-alpha in the cell allows the cell to be killed when the membrane bound TNF-alpha is targeted by an agent that binds it directly or indirectly, including an inhibitor.
• the TNF-alpha inhibitor is an antibody
• the cell may die by complement-dependent cytotoxicity, and in embodiments wherein the TNF-alpha inhibitor is not an antibody, the cell may die by another mechanism, such as apoptosis.
• the membrane cutting site(s) are ablated, thereby retaining surface expression on the cell and endowing the ability of the cell to be targeted for destruction.
• the disclosure contemplates mutant membrane-bound TNF- alpha as a suicide gene for the selective deletion of transduced cells.
• TNF-alpha has a 26kD transmembrane form and a 17 kD secretory component.
• FIG. 1 herein (right panel from Perez et al. (1990)) illustrates some mutants encompassed by the disclosure.
• examples of TNF-alpha mutants of the disclosure include at least the following with respect to the 17 kD TNF: (1) deletion of Vail and deletion of Proll2; (2) deletion of Vall3; (3) deletion of Vail and deletion of Vall3; (4) deletion of Vail through and including Proll2 and also deletion of Vall3 (delete 13aa); (5) deletion of Ala -3 through to and including Val 13 (delete 16 aa); (6) deletion of Ala-1 through to and include Vall3 (delete 14aa).
• a TNF-alpha mutant comprises deletion of the respective amino acid at position -3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or a combination thereof.
• the TNF-alpha mutants may be generated by any suitable method, but in specific embodiments they are generated by site-directed mutagenesis.
• the TNF-alpha mutants may have mutations other than those that render the protein uncleavable.
• the TNF-alpha mutants may have 1, 2, 3, or more mutations other than the deletions at Vail, Prol2, and/or Vall3 or the region there between.
• the mutations other than those that render the mutants nonsecretable may be one or more of an amino acid substitution, deletion, addition, inversion, and so forth.
• the additional mutation is an amino acid substitution, the substitution may or may not be to a conservative amino acid, for example.
• a TNF-alpha mutant has (1) one or more mutations that render the mutant nonsecretable; (2) one or more mutations that prevents outside- in signaling for the mutant; and/or (3) one or more mutations that interfere with binding of the mutant to TNF Receptor 1 and/or TNF Receptor 2 and render them inactive.
• TNFa mutant- del Vail to Proll2 delVall3 (delete 13 aa) nucleic acid sequence
• TNF-alpha mutant with del Ala-3 to Val 13 nucleic acid sequence in addition to an example of a CIK motif mutation that prevents outside-in signaling and other mutations that interfere with TNFalpha binding to TNF Receptor 1 and TNF Receptor 2 (see FIG. 10)
• TNF-alpha mutant with del Ala-3 to Val 13 amino acid sequence encoded by SEQ ID NO:40
• a TNF-alpha mutant may comprise deletion of Ala-3 to Vail 3 but not also comprise a CIK motif mutation and a mutation that interferes with binding to TNF Receptor 1 and/or TNF Receptor 2.
• TNF-alpha mutants lacking intracellular TNF signaling or TNF-receptor binding capability
• mutants have mutations in the cytoplasmic signaling domain and/or in the TNF-receptor binding regions and therefore do not exert any biological activity as they lack reverse signaling capability and/or the ability to bind TNF-receptors, respectively. This allows for the TNF-alpha in the construct to be a target for TNF inhibitors, while exerting no biological activity.
• TNF-alpha mutants lack part or all of the intracytoplasmic domain of TNF-alpha such that the TNF-alpha mutant is unable to exert intracellular signaling (reverse signaling).
• the nonsecretable TNF-alpha mutants may or may not also be mutated to lack part or all of the intracytoplasmic domain.
• FIG. 9 provides some structure of TNF-alpha.
• the intracytoplasmic domain comprises MS TES MIRD VELAEE ALPKKT GGPQGS RRCLFL (SEQ ID NO: 17).
• the casein kinase I (CKI) site is STES (SEQ ID NO: 18).
• the transmembrane domain is F S FLIV AG ATTLFCLLHF G VI (SEQ ID NO: 19).
• the SPPL2b cut site is SL/LI.
• the linker comprises GPQREEFPRDLS LIS PLAQ A (SEQ ID NO:20).
• the TACE cute site is VRSSSRTPSDKPV (SEQ ID NO:21).
• P01375 refers to the UniProt number of the protein.
• the sequence in FIG. 9 refers to only part of the TNF protein.
• TNF-alpha mutant for the CKI motif (mutated sequence underlined) for nucleic acid and amino acid, respectively, is as follows:
• TNF-alpha mutant having a mutation at M-71K in the intracytoplasmic sequence and another mutation at Y87H (mutated sequences underlined) for nucleic acid and amino acid, respectively, is as follows:
• TNF-alpha mutant having a mutation at S95F and C-28F (mutated sequences underlined) for nucleic acid and amino acid, respectively, is as follows:
• TNF-alpha mutant having a mutation at S133I and S147Y (mutated sequences underlined) for nucleic acid and amino acid, respectively, is as follows:
• TNF-alpha mutant having a mutation at Aspl43Tyr and a deletion of Ala at position -1 (mutated sequence underlined and deleted sequence shown by strikethrough) for nucleic acid and amino acid, respectively, is as follows:
• TNF-alpha mutant having a combination of the CIK motif mutation and the above-referenced mutations are as follows, with the mutations underlined:
• cells expressing the TNF-alpha mutant(s) may also express one or more therapeutic genes.
• the therapeutic genes may or may not be of the same type of molecule.
• a single cell may also express an engineered receptor, a cytokine, cytokine receptor, homing receptor, chemokine receptor, or a combination thereof.
• therapeutic gene nucleic acids Encompassed herein are therapeutic gene nucleic acids; therapeutic gene products, including polypeptides; vectors comprising the therapeutic gene nucleic acid; and cells harboring any thereof.
• the mutant is co-expressed with at least one therapeutic gene, including a therapeutic transgene.
• the therapeutic transgene may be of any kind, but in specific embodiments it encodes an engineered receptor.
• engineered receptors include at least a T-cell receptor, chimeric antigen receptor (CAR), chemokine receptor, cytokine receptor, homing receptor, or a combination thereof.
• Any engineered receptor may target any particular ligand, such as an antigen, including a cancer antigen (such as a tumor antigen).
• the cancer antigens may be of any kind, including those associated with a particular cancer to be treated and that is desired to be targeted for specific elimination of the cancer.
• the receptor comprises an antigen binding domain that may target any antigen, such as a tumor antigen.
• the antigen binding domain may comprise an scFv, for example.
• Antigenic molecules may come from infectious agents, auto-/self-antigens, tumor-/cancer-associated antigens, or tumor neoantigens, for example.
• antigens that may be targeted include but are not limited to antigens expressed on B-cells; antigens expressed on carcinomas, sarcomas, lymphomas, leukemia, germ cell tumors, and blastomas; antigens expressed on various immune cells; and antigens expressed on cells associated with various hematologic diseases, autoimmune diseases, and/or inflammatory diseases.
• specific antigens to target include CD 19, CD5, CD99, CD33, CLL1, CD123, 4-1BB, 5T4, adenocarcinoma antigen, alpha-fetoprotein, BAFF, B-lymphoma cell, C242 antigen, CA-125, carbonic anhydrase 9 (CA-IX), C-MET,
• Any antigen receptor that may be utilized in methods and compositions of the disclosure may target any one of the above-referenced antigens, or one or more others, and such an antigen receptor may be a CAR or a TCR.
• the same cells for therapy may utilize both a CAR and a TCR, in specific embodiments.
• the CAR may be first generation, second generation, or third or subsequent generation, for example.
• the CAR may or may not be bispecific to two or more different antigens.
• the CAR may comprise one or more co-stimulatory domains.
• Each co-stimulatory domain may comprise the costimulatory domain of any one or more of, for example, members of the TNFR superfamily, CD28, CD137 (4-1BB), CD134 (0X40), Dap 10, DAP 12, CD27, CD2, CD5, ICAM-1, LFA-1 (CDl la/CD18), Lck, TNFR-I, TNFR-II, Fas, CD30, CD40 or combinations thereof, for example.
• the CAR comprises CD3zeta.
• the CAR lacks one or more specific costimulatory domains; for example, the CAR may lack 4- IBB.
• the CAR comprises at least DAP12 as a costimulatory domain, and in certain aspects the CAR polypeptide comprises a particular DAP12 amino acid sequence or is encoded by a particular DAP12 nucleic acid sequence. Examples are as follows:
• the CAR comprises at least CD28 as a costimulatory domain, and in certain aspects the CAR polypeptide comprises a particular CD28 amino acid sequence or is encoded by a particular CD28 nucleic acid sequence. Examples are as follows:
• the CAR polypeptide comprises an extracellular spacer domain that links the antigen binding domain and the transmembrane domain.
• Extracellular spacer domains may include, but are not limited to, Fc fragments of antibodies or fragments or derivatives thereof, hinge regions of antibodies or fragments or derivatives thereof, CH2 regions of antibodies, CH3 regions antibodies, artificial spacer sequences or combinations thereof.
• Examples of extracellular spacer domains include but are not limited to CD8-alpha hinge, artificial spacers made of polypeptides such as Gly3, or CHI, CH3 domains of IgGs (such as human IgGl or IgG4).
• the extracellular spacer domain may comprise (i) a hinge, CH2 and CH3 regions of IgG4, (ii) a hinge region of IgG4, (iii) a hinge and CH2 of IgG4, (iv) a hinge region of CD8-alpha, (v) a hinge, CH2 and CH3 regions of IgGl, (vi) a hinge region of IgGl or (vi) a hinge and CH2 of IgGl or a combination thereof.
• the hinge is from IgGl and in certain aspects the CAR polypeptide comprises a particular IgGl hinge amino acid sequence or is encoded by a particular IgGl hinge nucleic acid sequence. Examples are as follows:
• the TNF-alpha mutant(s) may be delivered to the recipient cell by any suitable vector, including by a viral vector or by a non-viral vector.
• suitable vectors include at least retroviral, lentiviral, adenoviral, or adeno-associated viral vectors.
• non-viral vectors include at least plasmids, transposons, lipids, nanoparticles, and so forth.
• the TNF-alpha mutant gene and therapeutic gene may or may not be comprised on or with the same vector.
• the TNF-alpha mutant gene and the therapeutic gene are expressed from the same vector molecule, such as the same viral vector molecule.
• the expression of the TNF-alpha mutant gene and the therapeutic gene may or may not be regulated by the same regulatory element(s).
• the TNF-alpha mutant gene and the therapeutic gene are on the same vector, they may or may not be expressed as separate polypeptides. In cases wherein they are expressed as separate polypeptides, they may be separated on the vector by a 2A element or IRES element, for example.
• the TNF-alpha mutant and the therapeutic gene product are produced as a fusion protein.
• the TNF-alpha mutant gene is expressed from a multicistronic vector.
• the multicistronic vector may encode at least one therapeutic gene in addition to the TNF-alpha mutant gene.
• the multicistronic vector encodes the TNF-alpha mutant and at least one engineered receptor, such as a T-cell receptor and/or a CAR.
• the multicistronic vector encodes at least one TNF-alpha mutant, at least one engineered receptor, and at least one cytokine.
• the cytokine may be of a particular type of cytokine, such as human or mouse or any species. In specific cases, the cytokine is interleukin (IL)15, IL12, IL2, IL18, and/or IL21.
• IL interleukin
• nucleic acid sequence for a vector that encodes a TNF-alpha mutant del Vail del Prol2 and that separately encodes a CD19-specific CAR with an IgGl hinge, CD28, and CD3zeta and that separately encodes IL15 is as follows:
• amino acid sequence for a vector that encodes a TNF-alpha mutant del Vail del Prol2 and that separately encodes a CD19-specific CAR with an IgGl hinge, CD28, and CD3zeta and that separately encodes IL15 is as follows:
• nucleic acid sequence for a vector that encodes a TNF-alpha mutant del Vail del Prol2 and that separately encodes a CD19-specific CAR with an IgGl hinge, DAP12, and CD3zeta and that separately encodes IL15 is as follows:
• amino acid sequence for a vector that encodes a TNF-alpha mutant del Vail del Prol2 and that separately encodes a CD19-specific CAR with an IgGl hinge, DAP12, and CD3zeta and that separately encodes IL15 is as follows:
• Embodiments of the disclosure encompass cells that express one or more TNF- alpha mutants as encompassed herein.
• the cell comprises a recombinant nucleic acid that encodes one or more engineered nonsecretable, membrane bound TNF-alpha mutant polypeptides, in specific embodiments.
• the cell in addition to expressing one or more TNF-alpha mutant polypeptides, the cell also comprises a nucleic acid that encodes one or more therapeutic gene products.
• the nucleic acids may be vectors of any kind.
• the nucleic acid that encodes the one or more TNF-alpha mutant polypeptides may or may not be the same nucleic acid molecule that encodes the one or more therapeutic gene products.
• the cells of the disclosure may be of any kind, including at least T-cells, NK cells, NKT cells, iNKT cells, macrophages, B cells, MSCs, or stem cells of any kind, including at least hematopoietic stem cells, pluripotent embryonic stem cells or embryonic stem cells.
• the cells may be obtained from an individual directly or may be obtained from a depository or other storage facility.
• the cells as therapy may be autologous or allogeneic with respect to the individual to which the cells are provided as therapy.
• the cells may be from an individual in need of therapy for a medical condition, and following their manipulation to express the TNF-alpha mutant and therapeutic gene product (using standard techniques for transduction and expansion for adoptive cell therapy, for example), they may be provided back to the individual from which they were originally sourced. In some cases, the cells are stored for later use for the individual or another individual.
• the cells that harbor the one or more engineered receptors and that may be needed to be eliminated by the resident TNF-alpha suicide gene may be of any kind.
• the cells are immune cells or stem cells, including those that are being utilized for adoptive cell therapy, for example.
• the immune cells may be T-cells, NK cells, NKT cells, iNKT cells, B cells, and so forth.
• the cells may be comprised in a population of cells, and that population may have a majority that are transduced with one or more TNF-alpha mutant suicide genes or both of one or more engineered receptors and one or more TNF-alpha mutant suicide genes.
• a cell population may comprise 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
• TNF-alpha mutant(s) and the engineered receptor(s) are separate polypeptides.
• the cells may be produced with the TNF-alpha mutant suicide gene for the intent of being modular with respect to a specific purpose.
• cells may be generated, including for commercial distribution, expressing a TNF-alpha mutant (or distributed with a nucleic acid that encodes the mutant for subsequent transduction), and a user may modify them to express one or more therapeutic genes of interest dependent upon their intended purpose(s).
• an individual interested in treating CD5-positive cancer may obtain or generate the TNF-alpha mutant-expressing cells and modify them to express a CAR comprising a CD5-specific scFv.
• an individual interested in treating CD5-positive cancer may obtain cells to be transduced, obtain a vector that encodes the TNF-alpha mutant, and modify the vector also to encode a CD5-specific CAR, followed by subsequent transduction of the cells. Either of those embodiments may be applied to any other cancer antigen than CD5.
• the genome of the transduced cells expressing the TNF-alpha mutant may be modified.
• the genome may be modified in any manner, but in specific embodiments the genome is modified by CRISPR gene editing, for example.
• the genome of the cells may be modified to enhance effectiveness of the TNF-alpha mutant as a suicide gene, to enhance effectiveness of use of the therapeutic gene product, or for another purpose.
• genes that may be modified in the cells includes the following: knockout of ADAM13/TACE, increase resistance of TNF-alpha mutant expressing cells to the tumor microenvironment such as TGF-beta receptor 1 or 2, IDO, checkpoint molecules such as PD1, TIGIT, KLRG1, TIM3, etc.
• the cells for which the TNF-alpha mutant suicide gene are employed are cells that have the potential to be deleterious, for example for an individual exposed to the cells in vivo.
• the cells may be toxic to an individual upon delivery or thereafter, and therefore a need to be able to eliminate the cells may be consistently present for the cells.
• any type of cell therapy for use in an individual in vivo would be able to employ the disclosed TNF-alpha mutants in the cells, allowing the cell therapy to be terminated when desired.
• the cell therapy may be subject to utilization of the TNF-alpha mutant suicide gene when an individual receiving the cell therapy and/or having received the cell therapy shows one or more symptoms of one or more adverse events, such as cytokine release syndrome, neurotoxicity, anaphylaxis/allergy, and/or on-target/off tumor toxicities (as examples) or is considered at risk for having the one or more symptoms, including imminently.
• the use of the TNF-alpha mutant as a suicide gene may be part of a planned protocol for a therapy or may be used only upon a recognized need for its use. In some cases the cell therapy is terminated by use of agent(s) that targets the TNF-alpha suicide gene because the therapy is no longer required.
• the cells for which the TNF-alpha suicide gene is utilized may be cells engineered for cell therapy for mammals, in particular embodiments.
• the cell therapy may be of any kind and the cells may be of any kind.
• the cells are immune cells or stem cells that have been engineered to express one or more therapeutic gene products.
• the cells are cells that are transduced with one or more engineered receptors for the cells.
• the engineered receptors may impart a therapeutic characteristic for the cells upon targeting, such as by binding to, a ligand for the receptor.
• the engineered receptor is non-native and made by the hand of man.
• the engineered receptor may be of any kind including a T-cell receptor, a chimeric antigen receptor (CAR), chemokine receptor, cytokine receptor, homing receptor, gene-edited cells, or a combination thereof.
• the engineered receptors may be engineered to be able to bind, such as target, a specific antigen, including at least a tumor antigen, as an example.
• the engineered receptors may be bi- specific or multi- specific for more than one antigen, in some cases, allowing the transduced cells to bind through the engineered receptor to cells that express the multiple antigens.
• the majority of TNF-alpha mutant expressing cells are eliminated.
• greater than 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% of cells expressing the TNF-alpha mutants are eliminated in an individual.
• the delivery of the agent(s) to the individual may continue until one or more symptoms are no longer present or until a sufficient number of cells have been eliminated.
• the cell numbers in the individual may be monitored using the TNF-alpha mutants as markers.
• Embodiments of methods of the disclosure may comprise a first step of providing an effective amount of cell therapy to an individual in need thereof, wherein the cells comprise one or more nonsecretable TNF-alpha mutants; and, a second step of eliminating the cells using the TNF-alpha mutant(s) as suicide genes (directly or indirectly through cell death by any mechanism).
• the second step may be instigated upon onset of at least one adverse event for the individual, and that adverse event may be recognized by any means, including upon routine monitoring that may or may not be continuous from the beginning of the cell therapy.
• the adverse event(s) may be detected upon examination and/or testing.
• the individual may have elevated inflammatory cytokine(s) (merely as examples: interferon-gamma, granulocyte macrophage colony-stimulating factor, IL-10, IL-6 and TNF-alpha); fever; fatigue; hypotension; hypoxia, tachycardia; nausea; capillary leak; cardiac/renal/hepatic dysfunction; or a combination thereof, for example.
• cytokine release syndrome which may also be referred to as cytokine storm
• the individual may have elevated inflammatory cytokine(s) (merely as examples: interferon-gamma, granulocyte macrophage colony-stimulating factor, IL-10, IL-6 and TNF-alpha); fever; fatigue; hypotension; hypoxia, tachycardia; nausea; capillary leak; cardiac/renal/hepatic dysfunction; or a combination thereof, for example.
• the individual may have confusion, delirium, aplasia, and/or seizures.
• the individual is tested for a marker
• administration of one or more agents that bind the nonsecretable TNF-a during cytokine release syndrome or neurotoxicity have the added benefit of neutralizing the high levels of soluble TNF-alpha that contribute to the toxicity of the therapy.
• Soluble TNF-alpha is released at high levels during cytokine release syndrome and is a mediator of toxicity with CAR T-cell therapies.
• the administration of TNF-alpha antibodies encompassed herein have a dual beneficial effect- i.e. selective deletion of the TNF-alpha mutant-expressing cells as well as neutralizing soluble TNF-alpha causing toxicity.
• embodiments of the disclosure encompass methods of eliminating or reducing the severity of cytokine release syndrome in an individual receiving, or who has received, adoptive cell therapy in which the cells express a nonsecretable TNF-alpha mutant, comprising the step of providing an effective amount of an agent that binds the nonsecretable TNF-alpha mutant, said agent causing in the individual (a) elimination of at least some of the cells of the cell therapy; and (b) reduction in levels of soluble TNF-alpha.
• Embodiments of the disclosure include methods of reducing the effects of cytokine release syndrome in an individual that has received or who is receiving cell therapy with cells that express a nonsecretable TNF-alpha mutant, comprising the step of providing an effective amount of one or more agents that bind the mutant to cause in the individual (a) elimination of at least some of the cells of the cell therapy; and (b) reduction in the level of soluble TNF-alpha.
• the individual is provided an effective amount of one or more inhibitors that are able to inhibit, such as by binding directly, the TNF-alpha mutant on the surface of the cells.
• the inhibitor(s) may be provided to the individual systemically and/or locally in some embodiments.
• the inhibitor may be a polypeptide (such as an antibody), a nucleic acid, a small molecule (for example, a xanthine derivative), a peptide, or a combination thereof.
• the antibodies are FDA-approved.
• the inhibitor is an antibody
• the inhibitor may be a monoclonal antibody in at least some cases.
• one or more antibodies in the mixture may be a monoclonal antibody.
• small molecule TNF-alpha inhibitors include small molecules such as are described in U.S. Patent No. 5,118,500, which is
• polypeptide TNF-alpha inhibitors examples include polypeptides, such as those described in U.S. Patent No. 6,143,866, which is
• At least one antibody is utilized to target the TNF- alpha mutant to trigger its activity as a suicide gene.
• antibodies includes at least Adalimumab, Adalimumab-atto, Certolizumab pegol, Etanercept, Etanercept-szzs, Golimumab, Infliximab, Infliximab-dyyb, or a mixture thereof, for example.
• Embodiments of the disclosure include methods of reducing the risk of toxicity of a cell therapy for an individual by modifying cells of a cell therapy to express a nonsecretable TNF-alpha mutant.
• the cell therapy is for cancer, in specific embodiments, and it may comprise an engineered receptor that targets an antigen, including a cancer antigen.
• the individual in addition to the inventive cell therapy of the disclosure, may have been provided, may be provided, and/or may will be provided an additional therapy for the medical condition.
• the medical condition is cancer
• the individual may be provided one or more of surgery, radiation, immunotherapy (other than the cell therapy of the present disclosure), hormone therapy, gene therapy, chemotherapy, and so forth.
• the individual may have any type of cancer.
• the individual may have leukemia, lymphoma, myeloma, brain cancer, lung cancer, breast cancer, colon cancer, endometrium cancer, cervical cancer, ovarian cancer, testicular cancer, bone cancer, skin cancer, kidney cancer, liver cancer, stomach cancer, spleen cancer, thyroid cancer, head and neck cancer, gall bladder cancer, and so forth.
• compositions described herein may be comprised in a kit.
• cells, reagents to produce cells, vectors, and reagents to produce vectors and components thereof may be comprised in a kit.
• alpha-beta T-cells, gamma-delta T cells, NK cells, NKT cells, iNKT cells, B cells, or stem cells may be comprised in a kit.
• Such a kit may or may not have one or more reagents for manipulation of cells.
• Such reagents include small molecules, proteins, nucleic acids, antibodies, buffers, primers, nucleotides, salts, and/or a combination thereof, for example.
• Nucleotides that encode one or more TNF-alpha mutants, engineered receptors, or cytokines may be included in the kit.
• Proteins such as cytokines or antibodies, including monoclonal antibodies, may be included in the kit.
• Nucleotides that encode components of engineered receptors, such as chimeric antigen receptors or T-cell receptors may be included in the kit, including reagents to generate same.
• the kit comprises the cell therapy of the disclosure and also another cancer therapy.
• the kit in addition to the cell therapy embodiments, also includes a second cancer therapy, such as chemotherapy, hormone therapy, and/or
• kits may be tailored to a particular cancer for an individual and comprise respective second cancer therapies for the individual.
• kits may comprise suitably aliquoted compositions of the present disclosure.
• the components of the kits may be packaged either in aqueous media or in lyophilized form.
• the container means of the kits will generally include at least one vial, test tube, flask, bottle, syringe or other container means, into which a component may be placed, and preferably, suitably aliquoted. Where there are more than one component in the kit, the kit also may generally contain a second, third or other additional container into which the additional components may be separately placed. However, various combinations of components may be comprised in a vial.
• the kits of the present invention also will typically include a means for containing the composition and any other reagent containers in close confinement for commercial sale. Such containers may include injection or blow-molded plastic containers into which the desired vials are retained.
• FIG. 1 shows an example of an experimental plan to mutagenize TNF-alpha to ablate membrane cutting sites. As described by Perez et al. (1990), the right panel of FIG.
• FIG. 1 illustrates three exemplary TNF-alpha mutants that render the TNF-alpha mutant to be uncleavable: (1) deletion of amino acid residues 1-12 of the 17 kD TNF; (2) deletion of amino acid residues 1 and 12 of the 17 kD TNF; and (3) deletion of amino acid residues 1 and 13 of the 17 kD TNF.
• the left panel of FIG. 1 provides examples of primers for site-directed mutagenesis as an example to generate the mutants.
• FIGS. 2A, 2B, 2C, 2D, and 2E provide examples of vectors that may encode the TNF-alpha mutants.
• FIG. 2A illustrates a vector map example of a TNF-alpha mutant having deletions of amino acids Vail and Prol2, and the mutant is co-expressed with a CD19-specific CAR and is also co-expressed with IL-15, all as separate polypeptides, as an example.
• FIG. 2B illustrates a vector map example of a TNF-alpha mutant having a deletion at Valine 13, and the mutant is separately co-expressed with a CD19-specific CAR and separately co-expressed with IL-15, as an example.
• FIG. 2C illustrates a vector map example of a TNF-alpha mutant having deletions of amino acids Vail and Val 13, and the mutant is separately co-expressed with a CD19-specific CAR and IL-15, as an example.
• FIG. 2D illustrates a vector map example of a TNF-alpha mutant having deletions of amino acids Vail through to Val 13 (13 aa deletions), and the mutant is separately co-expressed with a CD19-specific CAR and IL-15, as an example.
• FIG. 2E illustrates a vector map example of a TNF-alpha mutant having deletions of amino acids Ala- 1 through to Val 13 (14 aa deletion), and the mutant is separately co-expressed with a CD19- specific CAR and IL-15, as an example.
• the mutated uncleavable TNF-alpha in cells transduced with a vector encoding both TNF-alpha mutant with deletions at Vail and Prol2 and a CD19-specific CAR, as an example) is stably expressed on the cell surface after, for example, viral transduction or electroporation of its encoding sequence (FIG. 3).
• FIG. 4A illustrates examples of anti-TNF antibodies.
• FIG. 4B demonstrates that greater than 70% of NK cells expressing mutant TNF-alpha are eliminated by complement dependent cytotoxicity (CDC) within 90 minutes of treatment with infliximab.
• CDC complement dependent cytotoxicity
• FIG. 5A demonstrates that in response to Raji targets, the NK cells transduced with a vector that co-expresses TNF-alpha mutant and an CD19-specific CAR produce more effector cytokines and degranulate more efficiently when compared to NK cells that express the anti-CD 19 CAR alone.
• Raji targets are efficiently killed by NK cells transduced with a vector that separately co-expresses a TNF-alpha mutant (deletion of Vail and Prol2, as an example) and a CD 19-specific CAR.
• the TNF-alpha mutant protein with deletions of Valine at position 1 Proline at position 12 is biologically active and mediates a strong anti-tumor response upon direct cell-cell contact, further contributing to the antitumor activity of the transduced cells.
• FIG. 6 The transduced NK cells harboring a vector that separately expresses a CD 19- specific CAR and a TNF-alpha mutant do not exhibit off-target activity.
• FIG. 7 demonstrates that NK cells transduced with a vector that separately expresses a CD19-specific CAR and a TNF-alpha mutant do not exhibit off-target activity and do not secrete TNF-alpha non- specific ally.
• FIG. 8 illustrates that TNF-alpha receptor binding sites for TNF receptors 1 and 2 vs. TNF-alpha antibodies infliximab and adalimumab are different. This demonstrates that the mutations in the TNFalpha gene will not negatively impact the ability of TNFalpha antibodies in recognizing the TNFa mutant protein; i.e. the TNFalpha mutant can still be used as a suicide gene and be targeted by the antibodies.
• TNF-alpha mutants vs. TNF-alpha wild type vs. exogenous TNF-alpha with TNF-alpha receptor 1 (TNF-R1) and TNF-alpha receptor 2 (TNF-R2).
• Such studies may incorporate measurement of apoptosis induction and caspase (downstream of TNF-R1) in Ramos cells (which express TNF R1 but not TNFR2).
• apoptosis induction and caspase downstream of TNF-R1 in Ramos cells (which express TNF R1 but not TNFR2).
• NFkappaB in Jurkat cells that express both TNFR2 and TNFR1.
• FIG. 11 provides a comparison of antitumor activity of CAR-NK cells from cord blood transduced with either TNF-alpha mut-CAR19-IL15 construct or inducible caspase 9 (iC9)-CAR19-IL15 constructs.
• FIG. 11A NSG mice with Raji tumor received 3 x 10e6 CAR cord blood NK cells transduced with TNF-alpha mut-CAR19-IL15 construct or transduced with iC9-CAR19-IL15 construct.
• FIG. 11B demonstrates percent survival over time. Mice transduced with TNF-alpha mut-CAR19-IL15 construct outlived control mice and mice transduced with iC9-CAR19-IL15 construct.
• TNF Tumor Necrosis Factor

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